DIY Dual-Layer LCD monitor - can it match OLED??
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Published 2023-03-13
Forum thread: forum.diyperks.com/displays-and-monitors-tvs/diy-d…
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All Comments (21)
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🥦 Let's hear it for the random broccoli
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I'm just amazed how accurately you were able to align the two LCDs
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If I remember correctly, Hisense has done this in one of their TVs. They achieved incredible contrast levels by using a second monochrome LCD layer to provide those inky blacks. Sadly, I don't think they've pursued it any further, synchronizing the LCD layers was quite difficult.
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ah yes, built in anti aliasing
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Something you didn't mention is that you have essentially doubled the display's gamma by multiplying all colors by themselves. Most displays have a built-in gamma of 2.2, but this raises that to around 4.4. You should be able to compensate by halving the gamma in software or in the monitor's settings, which will give you more accurate colors and fix over-saturation.
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I would love to see a V2 version of this where you dissemble the panels further and experiment with various filter layers.
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If you fed both screens different HDMI signals, like in a "mirrored" dual monitor computer setup (using two outputs from your graphic card), you'd be able to adjust both layers individually. This could help making the picture's colours less "poppy" and maybe even help increase the white levels.
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To deal with the polarization problem, you can put a sheet of polarizing material between the 2 screens at a 45 degree angle to the polarization. This will "turn" the polarization without the need for diffusion. Another option: buy 2 SQUARE monitors. Assemble the screens a quarter-turn from one another. Run software to quarter-turn the images so they align.
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Love seeing these diy projects that compete with hardware 10x the price
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i think removing the polarisation filter from the back lcd will help with brightness and eliminate the need of the tracing paper, you can then also bind both of the screens with uv glue used for screens, so there will be less blooming and blurryness in text
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You always come up with the most fascinating ideas. They aren't always practical, but the attention to detail you put in makes almost every build you do a piece of art.
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I think you could actually add a middle polarization layer between the other two. Weirdly, if the middle layer is at an angle between the other two, it allows light to pass through all three. I think this would actually allow more of the original light through than paper.
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Professional dual layer LCD monitors use a monochrome LCD as the rear panel, which is better for light to pass through, thus increasing the efficiency (though it is still significant less efficient than a single layer LCD). Also, with your method, you are significantly increasing the saturation, so you would need to get a calibration device to counter that. Still, this is a really cool project!
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One thing I think you might have missed is the gamma. Monitors are non-linear with respect to their input, and there is typically a compensation curve (gamma) to fix that. However, with two screens, your nonlinearity will be doubled and you will need to adjust your gamma curve (easily accessible in desktop OSs).
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It is literally kind of a dimmer OLED but without any risk of burn-in 🔥 Really well made ! Great job man, your creations are incredible.
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This guy is great…every time I have that question lingering in my mind as he’s showing it, he immediately give the explanation or reason for how something works for his projects. Like he reads our thoughts. Great informative video. Wish I had the resources and time to make one myself. I’d want to try this on some older cheap lcd tvs
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This is a project that I think deserves a version 2. You might get better results with different panel technologies (like TN VN and IPS), or you might be able to dig and find better solutions for diffusion, polarization, backlighting and driving the displays. Even if the final result is expensive and impractical I think it's worth it to see just how much is possible by going full DIY.
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Over ten years ago, students at RIT combined an Apple Cinema Display panel with a pair of projectors that, combined, matched the resolution of the display. The projectors projected the image in black and white behind the LCD panel displaying the same image in color. There were some off-axis alignment issues, but the first look at what HDR would eventually look like was stunning at the time.
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This really needs a part two.
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I came up with this idea myself a couple of years ago when I found out about how LED TVs with array backlights work, glad to see you tried it and that I was onto something!
